Software's are not simple programs any longer. They are complex in build and complex in execution. This very complexity of their nature makes it important to conduct intensive testing so as to ensure that it works in accordance with the specifications provided by the client.
Availability Testing is a measure of how often any given software is actually on hand and accessible for use. In other words, it measures the probability that the software will run as required and when required.
In Availability Testing, the software under test is run continuously for a fixed or planned period of time during which data is collected in terms of failure events and their repair times. In this manner, the deduced result is a prediction of the programs or software's availability probability.
The various parameters through which availability is tested are:
Availability = (MTBF / (MTBF + MTTR)) x 100
The various features of Availability Testing are:
Availability Testing makes for a more efficient program. This efficiency is not just in terms of the software run time, but also in terms of its recovery and repair time. Hence, a software that has been through Availability Testing is bound to be more competent and more effective in functioning.
Availability Testing ensures that the software is living up to the client's expectations of its operational stability. In other words, Availability Testing is a way to make sure that the software downtime is as less as possible and that it is always up and available, barring maybe a few expected scenarios like planned system maintenance, software up-gradation, etc.